Gonti's spell countered despite using delighted halfling mana to cast legendary spell, by dovin's veto.
Encountered this bug, casting a stolen Eternal Wanderer from Gonti's ability. On my turn, use a delighted halfings mana, create colorless and attempt to cast The Eternal Wanderer. Being Legendary the Delighted halfling mana used should make it uncounterable. Opponent, cast's dovin's veto, it resolves and counters the Eternal wanderer somehow. My Guess is because it's a stolen spell, it for some reason didn't register the uncounterable tag the spell should have recieved from the halflings mana?
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DAC169#34537 commented
If you used Delighted Halfling's ability to create colorless mana, that's why. Delighted Halfling has two abilities. The first is to simply generate 1 colorless mana. The second is to generate 1 mana of any color that can only be used on a Legendary spell & makes that spell unable to be countered.